Cyclic phosphates and thiophosphates useful as flame retardants for halogen-free polymers
US5072014A · kind A · utility
5Cited by
1References
10Claims
0Family size
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Inventor
Key dates
| Filing date | Jul 30, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Jul 30, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/5398
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen, C.sub.1 -C.sub.6 alkyl, or phenyl or naphthyl, each unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 alkyl groups, R.sub.3 and R.sub.4 are each independently of the other hydrogen or C.sub.1 -C.sub.4 alkyl, with the proviso that R.sub.3 and R.sub.4 may not simultaneously be hydrogen, and R.sub.5 is hydrogen, C.sub.1 -C.sub.6 alkyl, or phenyl or naphthyl, each unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 alkyl groups, and X is oxygen or sulfur, are very suitable flame retardants for polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.